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Loans and borrowings - Loan covenants (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
USD ($)
Mezzanine Debt Facility  
Loans and borrowings  
Minimum Available Cash and Cash Equivalent Investments required to be held $ 30,000
Minimum required Reserve Tail Ratio projection (as a percent) 25.00%
Mezzanine Debt Facility | If no amounts are outstanding under the Copper Stream  
Loans and borrowings  
Maximum required Total Net Debt to EBITDA ratio during the first calendar year 3.25
Maximum required Total Net Debt to EBITDA ratio, thereafter 3.00
Mezzanine Debt Facility | If any amounts are outstanding under the Copper Stream  
Loans and borrowings  
Maximum required Total Net Debt to EBITDA ratio during the first calendar year 3.50
Maximum required Total Net Debt to EBITDA ratio, thereafter 3.25
Senior Syndicated Facility Agreement  
Loans and borrowings  
Minimum Available Cash and Cash Equivalent Investments required to be held $ 30
Minimum required Reserve Tail Ratio projection (as a percent) 25.00%
Minimum required Debt Service Coverage Ratio, in respect of any rolling period of 12 consecutive months ending on 31 March, 30 June, 30 September, and 31 December 1.2
Cash flow forecast period 5 years
Minimum required Forecast Cash Flow Coverage Ratio 1.25
Maximum required Net Debt to EBITDA 2.5
Senior Syndicated Facility Agreement | If no amounts are outstanding under the Copper Stream  
Loans and borrowings  
Maximum required Total Net Debt to EBITDA ratio during the first calendar year 3.25
Maximum required Total Net Debt to EBITDA ratio, thereafter 3.00
Senior Syndicated Facility Agreement | If any amounts are outstanding under the Copper Stream  
Loans and borrowings  
Maximum required Total Net Debt to EBITDA ratio during the first calendar year 3.50
Maximum required Total Net Debt to EBITDA ratio, thereafter 3.25
Copper Purchase Agreement  
Loans and borrowings  
Minimum Available Cash and Cash Equivalent Investments required to be held $ 30,000
Maximum required Total Net Debt to EBITDA ratio, thereafter 3.25
Minimum required Reserve Tail Ratio projection (as a percent) 25.00%
Threshold amount of Uncredited Deposit after reduction, considered for maintenance of Reserve Tail Ratio $ 0
Maximum required Total Net Debt to EBITDA ratio during the period from the Closing Date of the Copper Stream to the first anniversary date 3.5
Silver Purchase Agreement  
Loans and borrowings  
Minimum Available Cash and Cash Equivalent Investments required to be held $ 30,000
Minimum required Reserve Tail Ratio projection (as a percent) 25.00%
Threshold amount of Uncredited Deposit after reduction, considered for maintenance of Reserve Tail Ratio $ 0
Silver Purchase Agreement | If no amounts are outstanding under the Copper Stream  
Loans and borrowings  
Maximum required Total Net Debt to EBITDA ratio during the first calendar year 3.25
Maximum required Total Net Debt to EBITDA ratio, thereafter 3.00
Silver Purchase Agreement | If any amounts are outstanding under the Copper Stream  
Loans and borrowings  
Maximum required Total Net Debt to EBITDA ratio during the first calendar year 3.50
Maximum required Total Net Debt to EBITDA ratio, thereafter 3.25